| 摘要 |
#CMT# #/CMT# Preparation of an acidic buffer solution in surface water, preferably in acidic and mineralized open-pit mining lakes, comprises: setting a primary carbon dioxide subsaturation in the water body by adding alkaline feedstock; subsequently adding carbon dioxide and/or carbon dioxide-generating feedstock; and adding the alkaline raw materials e.g. calcium oxide until the calcite saturation index for the water body is reduced to a value >= -5, the carbon dioxide partial pressure is reduced with respect to the initial value and the pH is set at a value >= 6. #CMT# : #/CMT# Preparation of an acidic buffer solution in surface water, preferably in acidic and mineralized open-pit mining lakes, by the use of alkaline raw materials such as calcium oxide, magnesium oxide, sodium hydroxide, calcium dihydroxide in the presence of carbon dioxide, comprises: setting a primary carbon dioxide subsaturation in the water body at a partial pressure of less than 0.00035 atm by adding alkaline feedstock, as a result of which the calcite saturation index for the water body increases to >= -5 and the pH increases from 8 to 12; simultaneously or subsequently adding carbon dioxide and/or carbon dioxide-generating feedstock, as a result of which the carbon dioxide partial pressure is raised to >= 0.00035 atm and the calcite saturation index for the water body is decreased to = 0 and the pH value is reduced to 5-8 or adjusting a primary carbon dioxide supersaturation in the water body by the addition of an appropriate quantity of carbon dioxide and/or carbon dioxide-generating feedstock, as a result of which the carbon dioxide partial pressure is raised to a value of >= 0.00035 atm and the calcite saturation index for the water body is reduced to a value = 0 and the pH value is reduced to a value of less than 8; and adding the alkaline raw materials until the calcite saturation index for the water body is reduced to a value >= -5, the carbon dioxide partial pressure is reduced with respect to the initial value and the pH is set at a value >= 6. #CMT#USE : #/CMT# The acidic buffer solution is useful for improving the water quality of surface water, preferably of acid and mineralized open-pit mining lakes. #CMT#ADVANTAGE : #/CMT# The acidic buffer solution effectively improves and preserves the quality of the large quantities of surface water in simple and economical way. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Process: The addition of alkaline and carbon dioxide containing feedstock takes place at intervals and in several sequential or parallel steps. The accomplishment of the procedure takes place in the water body or in a batch-wise manner outside the water body, in reaction vessels with a volume 5-100 m3>. The buffer suspensions produced outside the water body are brought into the water body to be treated by means of distribution mechanisms. The excess dissolved carbon dioxide in the water body is brought proportionately out of the water body along with the flowing-off groundwater into the groundwater reservoir and the appropriate rock bed. #CMT#EXAMPLE : #/CMT# No suitable example given. |
